EP2361334A2 - Displacement-controlled hydraulic system for multi-function machines - Google Patents
Displacement-controlled hydraulic system for multi-function machinesInfo
- Publication number
- EP2361334A2 EP2361334A2 EP09825446A EP09825446A EP2361334A2 EP 2361334 A2 EP2361334 A2 EP 2361334A2 EP 09825446 A EP09825446 A EP 09825446A EP 09825446 A EP09825446 A EP 09825446A EP 2361334 A2 EP2361334 A2 EP 2361334A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuators
- pumps
- machine
- hydraulic system
- displacement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20523—Internal combustion engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20561—Type of pump reversible
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20569—Type of pump capable of working as pump and motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/265—Control of multiple pressure sources
- F15B2211/2656—Control of multiple pressure sources by control of the pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/27—Directional control by means of the pressure source
Definitions
- the present invention generally relates to machines having multiple functions performed by hydraulic circuits. More particularly, this invention relates to a displacement-controlled (DC) hydraulic system for use on multi-function machines with earthmoving implements whose movements are performed by rotary and linear actuators.
- DC displacement-controlled
- FIG. 1 illustrates a compact excavator 100 as having a cab 101 mounted on top of an undercarriage 102 via a swing bearing (not shown) or other suitable device.
- the undercarriage 102 includes tracks 103 and associated drive components, such as drive sprockets, rollers, idlers, etc.
- the excavator 100 is further equipped with a blade 104 and an articulating mechanical arm 105 comprising a boom 106, a stick 107, and an attachment 108 represented as a bucket, though it should be understood that a variety of different attachments could be mounted to the arm 105.
- the functions of the excavator 100 include the motions of the boom 106, stick 107 and bucket 108, the offset of the arm 105 during excavation operations with the bucket 108, the motion of the blade 104 during grading operations, the swing motion for rotating the cab 101 , and the left and right travel motions of the tracks 103 during movement of the excavator 100.
- the blade 104, boom 106, stick 107, bucket 108 and offset functions are typically powered with linear actuators 20-25 (represented as hydraulic cylinders in FIG. 1 ), while the travel and swing functions are typically powered with rotary hydraulic motors (not shown in FIG. 1 ).
- Displacement control of linear actuators with single rod cylinders has been described in US patent 5,329,767 and German Patents DE000010303360A1 , EP000001588057A1 and WO002004067969, and offers the possibility of large reductions in energy requirements for hydraulic actuation systems.
- Other aspects of using displacement control systems can be better appreciated from further reference to Zimmerman et al., "The Effect of System Pressure Level on the Energy Consumption of Displacement Controlled Actuator Systems," Proc.
- the present invention provides a displacement-controlled hydraulic system for installation on a multi-function machine, and multi-function machines equipped with the hydraulic system.
- a displacement-controlled hydraulic system is installed on a multi-function machine having means for propelling the machine, at least a first implement, and multiple actuators that perform multiple functions of the machine.
- the multiple actuators comprise first actuators that control the first implement and second actuators that control the propelling means of the machine.
- the hydraulic system comprises multiple pumps for controlling the first actuators and optionally for controlling the second actuators, and valve means for enabling at least one of the pumps to sequentially control two of the multiple actuators and a corresponding two functions of the multiple functions performed thereby, wherein none of the pumps sequentially controls the second actuators in combination with any of the first actuators.
- a displacement- controlled hydraulic system adapted for installation on a multi-function machine comprises first and second travel actuators for propelling the machine, a plurality of function actuators for performing other functions of the machine, and a plurality of pumps.
- the first and second travel actuators are associated with oppositely- disposed first and second sides, respectively, of the machine.
- the plurality of pumps includes a first pump dedicated for powering the first travel actuator, a second pump dedicated for powering the second travel actuator, and multiple pumps for powering the function actuators. At least one of the multiple pumps for powering the function actuators is controllable for powering two or more of the function actuators.
- Another aspect of the invention is a multi-function machine, and particularly an excavator, equipped with a displacement-controlled hydraulic system.
- the excavator comprises means for propelling the excavator, at least a first earthmoving implement, multiple actuators that perform multiple functions of the excavator, a system for controlling and actuating the multiple actuators.
- the multiple actuators comprise first actuators that control the first earthmoving implement and second actuators that control the propelling means of the excavator.
- the system comprises multiple pumps for controlling the first actuators and optionally for controlling the second actuators.
- the excavator further comprises valve means for enabling at least one of the pumps to sequentially control two of the multiple actuators and a corresponding two functions of the multiple functions performed thereby, wherein none of the pumps sequentially controls the second actuators in combination with any of the first actuators.
- a significant advantage of this invention is the capability of switching between outputs of individual pumps to sequentially control multiple different machine functions of a multi-function machine, with the result that the machine is capable of using pumps in numbers less than the number of multiple functions of the machine.
- FIG. 1 schematically represents a compact excavator of a type known in the prior art.
- FIG. 2 represents a hydraulic actuation system for controlling functions of the excavator represented in FIG. 1 in accordance with an embodiment of this invention.
- the present invention provides a displacement-controlled (DC) hydraulic system for use on multi-function machines with implements whose movements are performed by rotary and linear actuators.
- An example is the excavator 100 represented in FIG. 1 , which was previously described as equipped multiple actuators that perform multiple functions of the excavator 100, including propulsion of the excavator 100 and movement of its multiple earthmoving implements 104-108.
- a nonlimiting commercial example of the excavator 100 is the Bobcat® 435 compact excavator manufactured by the Bobcat Company. While the invention will be discussed with specific reference to the excavator 100 of FIG. 1 , it should be understood that the invention is generally applicable to multi-function machines, including other types of excavators as well as wheel loaders and skid-steer loaders.
- each actuator which may be a rotary or linear hydraulic motor or actuator
- each actuator would perform a single function of the excavator 100.
- the invention provides "switching" the output of individual pumps to sequentially control two different machine functions, with the result that the excavator 100 is able to use pumps in numbers less than the number of multiple functions of the excavator 100.
- six pumps can be installed and used to control rotary and/or linear actuators that perform eight different functions, including drive motors for the excavator 100.
- FIG. 2 shows a hydraulic actuation system equipped with six pumps 14 through 19 with power sharing capabilities that enable control of eight functions of the excavator 100 represented in FIG. 1 , while maintaining independent control of rotary hydraulic drive/travel motors 26 and 27 of the excavator 100 regardless of simultaneous operation of the remaining functions.
- the pumps 14- 19 are represented as variable displacement pumps powered through mechanical connections 2 through 13 from a primary power source 1 , for example, an internal combustion engine.
- the mechanical connections 2-13 can be of any suitable type, for example, drive shafts 2-10 and 13 and gear boxes 11 and 12 that transfer and distribute rotary power from the power source 1 to the pumps 14-19.
- Controls 49 through 54 of any suitable type are used to control the displacements of the variable displacement pumps 14-19.
- the flows produced by the pumps 14-19 directly control the operations of the linear actuators (hydraulic cylinders) 20-25 previously identified in reference to FIG. 1 , as well as rotary hydraulic drive/travel motors 26 and 27 for the tracks 103 and a rotary hydraulic swing motor 28 for the cabin 101.
- These linear and rotary actuators 20-28 perform the several functions of the excavator 100, including the operation of the two earthmoving implements of the excavator 100, namely, the blade 104 and the articulating arm 105 (which, as represented in FIG. 1 , comprises the boom 106, stick 107 and bucket 108).
- Pumps 14 and 19 are each represented as controlling one of two different machine functions at any given time, with valves 29 through 32 provided to allow the output of each pump 14 and 19 to be switched between the two different machine functions controlled by that particular pump 14 or 19. As such, the valves 29-32 enable the pumps 14 and 19 to sequentially control multiple different machine functions assigned to them.
- the hydraulic system of FIG. 2 is represented as further including a hydraulic return system that includes a charge pump 33, accumulator 34, pressure control valve 35, reservoir 36, check valves 37-48, and control valves 49-54, whose functions within the system can be readily appreciated from FIG. 2.
- the pump 19 controls the rotary swing motor 28 that performs the swing function of the excavator cab 101 , and controls the linear actuators 24 and 25 that operate the excavator blade 104.
- the valves 29 and 30 enable switching of the pump 19 between control of the swing motor 28 (swing function) and control of the blade actuators (hydraulic cylinders) 24 and 24 (blade function) at any given time. As such, the swing function and the blade function cannot be performed simultaneously.
- the valves 31 and 32 enable switching of the pump 14 between control of the actuator (hydraulic cylinder) 23 that operates the bucket 108 and control of the actuator (hydraulic cylinder) 22 that controls the offset function of the articulating arm 105. As such, motion of the bucket 108 (with the actuator 23) and offset adjustments (with the actuator 22) cannot be simultaneously performed.
- the pumps 15 and 16 are dedicated to controlling the boom actuator (hydraulic cylinder) 21 and stick actuator (hydraulic cylinder) 20, respectively, and the pumps 17 and 18 as dedicated to controlling the drive/travel motors 26 and 27, respectively (travel function). As such, motion of the boom 106 and stick 107 and travel of the excavator 100 can be performed simultaneously.
- Sharing the bucket and the offset functions allows control of the boom 106 and stick 107 during the operation of the offset function, giving the most control possible of the excavator mechanical arm 105 during operation of the offset function. It is not desirable that the swing and offset functions (performed by the swing motor 28 and actuator 22, respectively) share a pump because they both control the angular orientation of the mechanical arm 105, and simultaneous operation of these functions is often desirable.
- the left and right travel functions are always independent of the other six (they never share a pump) to allow the excavator 100 full control while driving. While displacement control of the travel functions as shown in FIG. 2 is desirable, other control methods could be used, such as control valves, and the motors 26 and 27 could be electric motors or other types of motors that can be or must be controlled by other than variable displacement pumps. It should also be noted that the invention can be applied to wheeled excavators as well as the track-type excavator represented in FIG. 1.
- a pump-controlled (displacement-controlled) hydraulic system as described above eliminates the need for control valves and the large energy losses existing with throttle-based control methods. This consequently reduces the heat generated by the system and thus reduces the cooling requirements of the system.
- the pump-controlled system also allows energy saving through the recovery of energy through any of the variable displacement pumps 14-19 and redistributing the recovered energy to power simultaneous operations of other functions.
- the system architecture is simplified, requiring fewer components, generating fewer potential leak points in the system, and minimizing the number of pumps required to have full control of the system using pump- controlled actuation.
- the system minimizes the number of pumps required for a pump-controlled multi-function machine while maintaining independent control of the travel motors, for example, a hydrostatic drive.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11175208P | 2008-11-06 | 2008-11-06 | |
US12/612,969 US8191290B2 (en) | 2008-11-06 | 2009-11-05 | Displacement-controlled hydraulic system for multi-function machines |
PCT/US2009/063492 WO2010054149A2 (en) | 2008-11-06 | 2009-11-06 | Displacement-controlled hydraulic system for multi-function machines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2361334A2 true EP2361334A2 (en) | 2011-08-31 |
EP2361334A4 EP2361334A4 (en) | 2014-03-05 |
Family
ID=42153563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20090825446 Withdrawn EP2361334A4 (en) | 2008-11-06 | 2009-11-06 | Displacement-controlled hydraulic system for multi-function machines |
Country Status (4)
Country | Link |
---|---|
US (1) | US8191290B2 (en) |
EP (1) | EP2361334A4 (en) |
KR (1) | KR101377336B1 (en) |
WO (1) | WO2010054149A2 (en) |
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DE202007011783U1 (en) * | 2007-08-23 | 2008-12-24 | Liebherr-France Sas, Colmar | Hydraulic drive, in particular an excavator, in particular for a slewing gear |
US9303386B2 (en) * | 2009-03-29 | 2016-04-05 | Stephen T. Schmidt | Tool attachments on an auto-powered mobile machine |
KR101601979B1 (en) * | 2009-12-24 | 2016-03-10 | 두산인프라코어 주식회사 | Pump Control Actuation System of Construction Machinery |
US8362629B2 (en) * | 2010-03-23 | 2013-01-29 | Bucyrus International Inc. | Energy management system for heavy equipment |
US8966892B2 (en) | 2011-08-31 | 2015-03-03 | Caterpillar Inc. | Meterless hydraulic system having restricted primary makeup |
US8944103B2 (en) | 2011-08-31 | 2015-02-03 | Caterpillar Inc. | Meterless hydraulic system having displacement control valve |
US8863509B2 (en) | 2011-08-31 | 2014-10-21 | Caterpillar Inc. | Meterless hydraulic system having load-holding bypass |
US9151018B2 (en) | 2011-09-30 | 2015-10-06 | Caterpillar Inc. | Closed-loop hydraulic system having energy recovery |
US8966891B2 (en) | 2011-09-30 | 2015-03-03 | Caterpillar Inc. | Meterless hydraulic system having pump protection |
US9051714B2 (en) | 2011-09-30 | 2015-06-09 | Caterpillar Inc. | Meterless hydraulic system having multi-actuator circuit |
US9057389B2 (en) | 2011-09-30 | 2015-06-16 | Caterpillar Inc. | Meterless hydraulic system having multi-actuator circuit |
WO2013051737A1 (en) * | 2011-10-05 | 2013-04-11 | 볼보 컨스트럭션 이큅먼트 에이비 | System for controlling land leveling work which uses an excavator |
US20130098012A1 (en) * | 2011-10-21 | 2013-04-25 | Patrick Opdenbosch | Meterless hydraulic system having multi-circuit recuperation |
US8973358B2 (en) | 2011-10-21 | 2015-03-10 | Caterpillar Inc. | Closed-loop hydraulic system having force modulation |
US9068578B2 (en) | 2011-10-21 | 2015-06-30 | Caterpillar Inc. | Hydraulic system having flow combining capabilities |
US8978373B2 (en) | 2011-10-21 | 2015-03-17 | Caterpillar Inc. | Meterless hydraulic system having flow sharing and combining functionality |
US8943819B2 (en) | 2011-10-21 | 2015-02-03 | Caterpillar Inc. | Hydraulic system |
US9080310B2 (en) | 2011-10-21 | 2015-07-14 | Caterpillar Inc. | Closed-loop hydraulic system having regeneration configuration |
US8978374B2 (en) | 2011-10-21 | 2015-03-17 | Caterpillar Inc. | Meterless hydraulic system having flow sharing and combining functionality |
US8984873B2 (en) | 2011-10-21 | 2015-03-24 | Caterpillar Inc. | Meterless hydraulic system having flow sharing and combining functionality |
US8893490B2 (en) | 2011-10-21 | 2014-11-25 | Caterpillar Inc. | Hydraulic system |
US8919114B2 (en) | 2011-10-21 | 2014-12-30 | Caterpillar Inc. | Closed-loop hydraulic system having priority-based sharing |
US8910474B2 (en) | 2011-10-21 | 2014-12-16 | Caterpillar Inc. | Hydraulic system |
CN103135512B (en) * | 2011-12-02 | 2015-10-21 | 中铁隧道集团有限公司 | Shield structure electro-hydraulic control system comprehensive test platform |
US9010467B2 (en) * | 2012-04-23 | 2015-04-21 | Federal Signal Corporation | Shared power street sweeper |
US9279236B2 (en) | 2012-06-04 | 2016-03-08 | Caterpillar Inc. | Electro-hydraulic system for recovering and reusing potential energy |
US9290912B2 (en) | 2012-10-31 | 2016-03-22 | Caterpillar Inc. | Energy recovery system having integrated boom/swing circuits |
US9290911B2 (en) | 2013-02-19 | 2016-03-22 | Caterpillar Inc. | Energy recovery system for hydraulic machine |
US20150059325A1 (en) * | 2013-09-03 | 2015-03-05 | Caterpillar Inc. | Hybrid Apparatus and Method for Hydraulic Systems |
CN104088324A (en) * | 2013-12-02 | 2014-10-08 | 湖南万容科技股份有限公司 | Excavator hydraulic system and excavator |
GB2529909B (en) | 2014-09-30 | 2016-11-23 | Artemis Intelligent Power Ltd | Industrial system with synthetically commutated variable displacement fluid working machine |
US10385892B2 (en) | 2016-12-20 | 2019-08-20 | Caterpillar Global Mining Llc | System and method for providing hydraulic power |
CN109563698B (en) * | 2017-03-29 | 2021-04-20 | 日立建机株式会社 | Working machine |
US11603209B2 (en) | 2017-10-11 | 2023-03-14 | Purdue Research Foundation | Aviation hydraulic propulsion system utilizing secondary controlled drives |
EP4271582A1 (en) * | 2020-12-30 | 2023-11-08 | Artemis Intelligent Power Limited | Controller for hydraulic apparatus for a vehicle |
US11713077B2 (en) | 2021-03-11 | 2023-08-01 | Vortrex LLC | Systems and methods for electric track vehicle control |
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-
2009
- 2009-11-05 US US12/612,969 patent/US8191290B2/en not_active Expired - Fee Related
- 2009-11-06 KR KR1020117012733A patent/KR101377336B1/en active IP Right Grant
- 2009-11-06 WO PCT/US2009/063492 patent/WO2010054149A2/en active Application Filing
- 2009-11-06 EP EP20090825446 patent/EP2361334A4/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040123499A1 (en) * | 2002-12-26 | 2004-07-01 | Kubota Corporation | Hydraulic circuit for backhoe |
EP1588057A1 (en) * | 2003-01-29 | 2005-10-26 | CNH Baumaschinen GmbH | Hydraulic system for linear drives controlled by a displacer element |
JP2005297815A (en) * | 2004-04-13 | 2005-10-27 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Hydraulic control device for construction machine |
EP1905903A1 (en) * | 2006-09-29 | 2008-04-02 | Kubota Corporation | Backhoe hydraulic system |
Non-Patent Citations (1)
Title |
---|
See also references of WO2010054149A2 * |
Also Published As
Publication number | Publication date |
---|---|
KR20110097805A (en) | 2011-08-31 |
KR101377336B1 (en) | 2014-03-27 |
US20100162593A1 (en) | 2010-07-01 |
US8191290B2 (en) | 2012-06-05 |
WO2010054149A3 (en) | 2010-07-29 |
WO2010054149A2 (en) | 2010-05-14 |
EP2361334A4 (en) | 2014-03-05 |
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